In the printing business this is what's called a, "strike-through, make-ready".
Before mass production can be started, the printer checks to make sure certain things check out right. A single sheet of paper is used to check the set-up of equipment. They make adjustments to colors and images. To save paper, they then flip the same paper around and retest.
Only a couple of these, "strike-through, make-ready's" are known to exist! Making this a grand piece of memorabilia!
spfreaks.com is now providing Memorabilia for Memorabilia Mondays
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